KakouCalc
/
🏠

Interest Only Calculator

Compare interest-only payments to fully amortizing payments after the IO period.

Reviewed by the KakouCalc editorial team · Updated July 2026

$
%
Interest-Only Payment
$1,500.00
Payment After IO Period
$2,149.29
Payment Increase
$649.29
IO Period
10 yrs
Remaining Amortization
20 yrs
Embed this calculator on your site

Free to embed. Paste this where you want the calculator to appear — the link back to KakouCalc is all we ask, and it's baked in.

Preview ↗

How to use the Interest Only Calculator

The Interest Only Calculator is free and runs entirely in your browser — no sign-up, and nothing you enter leaves your device. It opens pre-filled with a realistic example, so you can see how it works before replacing any figure with your own; the results update as you type. Press Calculate to refresh the result panel, or Reset to return to the example.

The inputs it asks for:

  • Loan Amount — a dollar amount.
  • Annual Interest Rate — a percentage (enter 6 for 6%).
  • Interest-Only Period (yrs) — a number.
  • Total Loan Term (Years) — a number.

Worked example

Using the example values — Loan Amount $300,000.00, Annual Interest Rate 6%, Interest-Only Period (yrs) 10, Total Loan Term (Years) 30 — the Interest Only Calculator returns a Interest-Only Payment of $1,500.00. It also reports Payment After IO Period ($2,149.29), Payment Increase ($649.29), IO Period (10 yrs).

Prefer your own numbers? Change any field above and this recomputes instantly.

Educational information, not financial advice. See our methodology for how these tools are built and checked.